Precise determination of the parameters of resonances f0(500) and f0(980) by fitting the data and dispersion relations
1 Institute of Nuclear Physics PAN, Kraków, Poland
2 Universidad Complutense de Madrid, Spain
a e-mail: email@example.com
The long-standing puzzle in the parameters of the f0(500), as well as the f0(980), is finally being settled  thanks to precise dispersive analyses carried out during the last years. Here we report on our very recent dispersive data analysis which allowed for a precise and model independent determination of the amplitudes for the S, P, D and F waves [2–4]. The analytic continuation of once subtracted dispersion relations for the S0 wave to the complex energy plane leads to very precise results for the f0(500) pole: √spole = 457-13+14 - i279-7+11 MeV and for the f0(980) pole: √spole = 996 ± 7 - i25-6+10 MeV.
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